xxxxxxxxx.com is currently unable to handle this request. 500 Error
Let's look at this by steps :
1) On website, I click on any icon of soc network from your plugin.
2) It's working on soc network side - facebook asks for a password... I log in to facebook account (Or YouTube account - I tried both)
3) It's asking for permissions, and after I allow - it's going back on my website and here is where I'm getting this error.
4) If I reload the page, after error, module (soc login) never show up himself again until I clear the cache or use another browser.